In this paper, in order to solve the problems of poor description ability and flexibility existed in existing workflow management system, a new workflow modeling method based on coordination theory and feedback mechanism is put forward. The proposed method extends the traditional activity network model and introduces the new modeling mechanism. Several new modeling elements, such as request node, service node, coordination node, and multiple instance node are added to the modeling method. The detailed realization mechanism and application scenarios are given in this paper and two examples are presented too.Research results show that compared with traditional actibity network model,the proposed method has significant asvantages in enhancing description ability,reducing model complexity,and improving system flexibility and adaptability.The proposed method has important value in designing and developing workflow management systems with high reliable,flexibility,andadaptability.